Studies on fatigue life enhancement of pre-fatigued spring steel specimens using laser shock peening

Ganesh, P.; Sundar, R.; Kumar, Harish; Kaul, R.; Ranganathan, K.; Hedaoo, P.; Raghavendra, G.; Kumar, S. Anand; Tiwari, Pragya; Nagpure, D. C.; Bindra, K. S.; Kukreja, L. M.; Oak, S. M.

doi:10.1016/j.matdes.2013.08.104

Cited by 78 publications

(25 citation statements)

References 28 publications

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“…In X-ray diffraction, the tetragonality of martensite brings about fine splitting of martensite peak which usually appears in the form of a broadened peak (Cullity, 1978). About 125 µm thick layer, associated with minimum peak width (FWHM) of 2.8 -2.9, matches with metallographic observations and associated drop in micro-hardness from about 450 HK in the bulk to about 250-300 HK in the decarburized region (Ganesh et al, 2014). This implies that surface decarburization brought about considerable reduction in tetragonality of ferrite phase and associated peak width.…”

Section: Surface Decarburization In Hardened and Tempered Plate Of Sasupporting

confidence: 54%

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Non-destructive Micro-structural Characterization of Metallic Specimens with a Portable X-ray Diffraction based Residual Stress Analyzer

Ganesh

Nagpure

Kaul

et al. 2015

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Non-destructive characterization of surface microstructure of an engineering component is an important parameter to assess its fitness to function in the given service conditions. The paper describes various case studies performed in authors' laboratory involving use of portable X-ray diffraction based residual stress analysis system to examine and understand the micro-structural state of the investigated surface. A significant decrease in full width at half maximum (FWHM) of gamma(311) diffraction peak from about 4.2° in the cold worked state to about 2.5° in the annealed/surface melted state was recorded for austenitic stainless steel. In case of 0.4% carbon steel there is sharp increase in FWHM of alpha(211) diffraction peak from about 2° in the as received condition to about 5-6° in the laser hardened condition. Crystallographic texture developed during electro-plating of chromium on stainless steel, could be detected from the strong intensity of alpha (211) peak of chromium at about 19° to the surface normal with respect to all other X-ray inclination angles (ѱ) during residual stress measurement. The results show that FWHM and intensity variation of the diffraction peak are two sensitive parameters for characterization of surface microstructure. Change in FWHM has been used to detect machining-induced cold deformation and evolution of re-crystallized grains in austenitic stainless steel and formation of hard martensite in laser transformation hardened ferritic steel. Variation in the intensity of diffracted peak with respect to X-ray inclination angle provided valuable information regarding crystallographic texture in hard chrome plated deposits.

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Section: Surface Decarburization In Hardened and Tempered Plate Of Sasupporting

confidence: 54%

“…The nature of the modified surface layer is an important factor governing component's performance with respect to corrosion, wear and fatigue etc. (Ghosh et al, 2010, Ghosh et al, 2011, Ganesh et al, 2014.…”

Section: Machining-induced Cold Deformation In Type 304 Stainless Steelmentioning

confidence: 99%

Non-destructive Micro-structural Characterization of Metallic Specimens with a Portable X-ray Diffraction based Residual Stress Analyzer

Ganesh

Nagpure

Kaul

et al. 2015

SET

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“…Shot peening based surface modification technology considerably improved the fatigue life of metallic materials over the last few decades. In general, it is well known that the process exhibits desirable property enhancement of engineering materials/components through induction of compressive residual stresses (RS) [1][2][3][4][5][6]. Since this technology introduces poor surface finish and less magnitude of penetration of compressive RS.…”

Section: Introductionmentioning

confidence: 99%

“…The evolved decarburization on the hardened and tempered metal surface is removed completely during the laser ablation process [3]. The multiple laser shock peening without coating (LSPwC) using decarburized surface as an ablation protective layer on the low-alloy steel substantially increases the fatigue life of the specimen.…”

Section: Introductionmentioning

confidence: 99%

Warm laser shock peening without coating induced phase transformations and pinning effect on fatigue life of low-alloy steel

Prabhakaran

Kalainathan

2016

Materials & Design

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“…In general, short pulse laser with pulse-width in the order of several to tens of nanoseconds (ns) has been effectively used to strengthen the mechanical properties of a variety of metal materials [6][7][8][9][10]. Two modes of laser systems are normally used for these applications, namely Q-switched Nd:YAG laser system [11] and Nd:Glass laser system [12].…”

Section: Introductionmentioning

confidence: 99%

Study and development of high peak power short pulse Nd:YAG laser for peening applications

Qiao

Zhao

Yang

2015

Sci. China Technol. Sci.

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Because short pulse Nd:YAG laser of nanosecond pulse-width and high peak power has a unique capability to improve the mechanical properties of metal parts, a study on the development of high peak power short pulse from Nd:YAG laser along with its peening application has been performed. The design scheme of laser and the characteristic of laser beam transmission are presented and discussed. A pulse energy of 25 J with 15 ns pulse-width and a maximum peak power of 1660 kW laser system which use one oscillation and eight amplifiers has been achieved. Laser beam has a max divergence angle of 0.03 mrad, a pulse-to-pulse pulse-width stability of ±0.1 ns, and the pulse-to-pulse energy stability factors of less than ±2.8%. A low value of divergence means an easier modification of a nearly hat-top laser beam intensity profile and an easier transmission of laser beam. To evaluate the performance of the laser system, several metal materials are processed. Laser peening quality and efficiency are analyzed by using an optical microscope, a transmission electron microscope, and an X-ray diffraction device. The processing results show that the performance of this laser system is excellent.YAG laser, laser beam, peak power, laser peening Citation:Qiao H C, Zhao J B, Yang H. Study and development of high peak power short pulse Nd:YAG laser for peening applications.

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Studies on fatigue life enhancement of pre-fatigued spring steel specimens using laser shock peening

Cited by 78 publications

References 28 publications

Non-destructive Micro-structural Characterization of Metallic Specimens with a Portable X-ray Diffraction based Residual Stress Analyzer

Non-destructive Micro-structural Characterization of Metallic Specimens with a Portable X-ray Diffraction based Residual Stress Analyzer

Warm laser shock peening without coating induced phase transformations and pinning effect on fatigue life of low-alloy steel

Study and development of high peak power short pulse Nd:YAG laser for peening applications

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